News

After finishing of the all tender procedures Olsztyn municipality together with nominated technology provider AAT started to build a biogas plant. In this biogas plant 115 t/d of organic waste (mainly the separately collected food/kitchen) waste will arrive to the site and further will be prepared and digested. From the produced biogas the electricity will be generated with a power of up to 1MW. To provide more flexibility to the future biogas plant was decided to design and build 2 independent lines with digester, post digester and final storage on each line. The biogas plant will be equipped with a most innovative and efficient equipment for the waste treatment and fermentation from the well-known European manufactures. Technical data of the plant: - 2 digesters with 4,000 m³ volume each (Ø 22m x 6 m) - Biogas production: 408 Nm³/d - Capacity generation electrical energy: 1MW - Energy generated: 8760 MWh/a - Capacity generation thermal energy: 1MW - Thermal energy generated: 8760 MWh/a - Fertilizer production: 105t/d

Our long-term customer in Austria  The new AAT emergency flare for the Sappi pulp mill at the Gratkorn plant in Austria has been in operation since September 2024. We are pleased about the many years of successful cooperation. Project data: - Flare for 600 m³/h gas flow - Thermal power 5,100 kW - LOGO control system - with pilot burner - Winter package with insulation and trace heating - gravel filter included in AAT scope of supply

The waste water treatment plant in Nemetin, Croatia has been expanded  AAT designed and delivered the gas line consisting of: gravel filter, gas cooling, gas warming, active carbon filter for the reduction of siloxanes and hydrogen sulphides as well as pressure boosters, a double-membrane-gas storage the emergency flare and agitators. This increases the service life of the CHP units for power generation and the operation reliability of the plant. Design data: - Gas cooling and warming Quantity: 200 Nm³/h - Active carbon filter: Quantity: 2x 200 Nm³/h Gas purification of the hydrogen sulphides to < 5 ppm H2S and siloxanes to < 2,0 mg/m³ - Double membrane gas storage: Nominal volume: 1.530 m³ - Gas emergency flare: Quantity: max. 250 m³/h

Electricity and heat from cattle manure In Japan, in the prefecture of Tochigi, a new AAT biogas plant was put into operation. The project was realised in cooperation with ENBC. The operator of the plant is Morinaga Milk Industry, which produces 616 Nm³ of biogas per day from cattle manure. When planning the plant, particular attention was paid to implementing a circular economy. The resulting digestate is dewatered and the solid fraction is used as bedding for the stables after drying. The separated liquid fraction passes through a downstream full treatment process to produce clear water. Technical data for the plant: - 1 digester with total volume of 1,100 m³ ( Ø 15m x 7.25 m) - Biogas production: 616 Nm³/d - Digestate for use as fertilizer: 29 to/d - Capacity generation electrical energy: 54 kW - Energy generated: 471 MWh/a - Capacity generation thermal energy: 71 kW - Thermal energy generated: 619 MWh/a

Pioneering project in Switzerland  With Recycling Energie AG we have already successfully implemented the largest biogas plant in Switzerland. Now a CO2 liquefaction plant was built as an expansion to the biogas plant, operated by CO2 Energie AG, which was founded specifically for this purpose. Biogas produced from organic waste is used for electricity and heat production by CHP units and is upgraded to biomethane. The biomethane is fed into the natural gas grid, the CO2 was previously released into the atmosphere. The new plant uses a cryogenic process to liquefy gaseous CO2, making it available in liquid form for storage and transportation. The food-grade liquid CO2 will be used in food production, the construction sector, greenhouses and silo fumigation in the animal feed sector and replaces the fossil-based CO2 currently used. The construction of the first plant of this kind in Europe is an important milestone on the way to decarbonizing the energy system. Marketing the liquid CO2 as a product from the biogas plant is an interesting aspect for plant operators in terms of economic efficiency and sustainability. Project data: - Capacity: 500 kg/h liquid CO2 - Production: roughly 4.000 t/a liquid CO2 - Pressure: 18 bar - Temperature: - 24°C - Modular container design - 2x 12m high storage tanks

Double membrane gas storage for extreme climate conditions!  Since the beginning of this year the AAT double membrane gas storage with 5.000 m³ is set up in Juuka, Finland. It was built for our customer Doranova Oy and is suitable for the extreme temperature conditions in Northern Europe. We are looking forward to implement further projects in Finland with 30 years of AAT expertise and specifically tailored solutions for our customers. Project data: - Volume 5.000 m³ - Operating pressure 10mbar - Diameter 22,45 m - Height 16,84 m - including snow clearance rope - ambient temperature min. -30°C, max. +70°C

How sewage sludge could provide heat and warm water for around 70 households  Currently, our AAT package plant digestion is under construction in Bad Goisern, Austria. Digester and dry gas storage are efficiently combined in one building, keeping construction costs low. Biogas production is maximized as full mixing of the digester volume is guaranteed. The AAT package plant digestion is optimally suited for small sludge volumes on small plants. If the biogas were upgraded to natural gas quality, about 70 households with 100m² living space could be heated and supplied with hot water! Project data: - Commissioning: end of 2022 - Input secondary sludge: ~ 42 m³/d - Gas production: ~ 20 m³/h

AAT custom-built production for international research project  Hydrogen from renewable sources is seen as having great potential for decarbonising the gas supply and is therefore becoming increasingly important politically. AAT supplied a hydrogen flare for the BioRoburPlus research project. The aim of the project is the decentralised production of pure hydrogen from biogas. For this purpose, biogas is converted in a steam reformer and then purified to 99.9% hydrogen. The AAT hydrogen flare ensures the necessary process safety and is equipped with a specially developed pilot/back-up burner. Design data for the hydrogen flare: Medium: Hydrogen/process gas Flow: 100 m³/h Height: 5.6 m

Biogas treatment was expanded at the wastewater treatment plant in Lublin, Poland. AAT planned and supplied biological desulphurisation units, gas cooler, gas heater and activated carbon filters for the reduction of siloxanes and hydrogen sulphide. This increases the service life of the CHP units for power production and operational reliability of the plant. Design data: - Biological desulphurisation units: Gas flow 2x 830 m³/h Gas cleaning of hydrogen sulphide from 3000 ppm H2S to < 50 ppm H2S - Gas cooler and gas heater: Gas flow 1660 m³/h - Activated carbon filters: Gas flow 2x 840 m³/h Gas cleaning of hydrogen sulphide to < 5 ppm H2S and siloxanes to < 2,0 mg/m³